Generally, a download manager enables downloading of large files or multiples files in one session.Many web browsers, such as Internet Explorer 9, include a download manager.Stand-alone download managers also are available, including the Microsoft Download Manager.

if you do not have a download manager installed, and still want to download the file(s) you've chosen, please note:

You may not be able to download multiple files at the same time.In this case, you will have to download the files individually.(You would have the opportunity to download individual files on the "Thank you for downloading" page after completing your download.)

Files larger than 1 GB may take much longer to download and might not download correctly.

You might not be able to pause the active downloads or resume downloads that have failed.

The Microsoft Download Manager solves these potential problems.It gives you the ability to download multiple files at one time and download large files quickly and reliably.It also allows you to suspend active downloads and resume downloads that have failed.

The Windows Phone SDK 7.1.1 Update provides additional functionality to the existing Windows Phone SDK 7.1. Using this update, you can more easily develop apps and games that are optimized to run on 256-MB devices. This update includes a new 256-MB version of Windows Phone Emulator, an updated 512-MB version of Windows Phone Emulator, and IntelliSense support.

Windows Phone Emulator supports GPU peripheral emulation using the host GPU on computers that meet Windows Phone SDK 7.1.1 Update system requirements. On all other computers, the emulator reverts to software emulation, which is not supported.

Windows Phone SDK 7.1 must be installed on your computer before you can install Windows Phone SDK 7.1.1. For more information, see Installing Windows Phone SDK.
To install Windows Phone SDK 7.1.1 Update, click the Download button for WPSDK-7.1.1-KB2669191-x86.exe file, and then follow the instructions to install the SDK.Note: This update configures a 256-MB emulator and a 512-MB emulator as part of the installation, and so might take longer to install than a typical SDK.

The Windows Phone 8.1 Update Emulators package adds additional emulator images to an existing installation of Visual Studio 2013 Update 2 or later. With this update installed, you can create and test apps that will run on devices that have Windows Phone 8.1 Update.